Finger warts are caused by human papillomavirus (HPV) infection and are viral benign growths. Flat warts are contagious and can be transmitted through direct and indirect contact. Flat warts are usually caused by HPV-3 viral infection, preferred in children and adolescents, easy to occur on the face, back of the hands, forearms, may have an impact on the appearance of the skin, resulting in the local appearance of rice grains, soybean size, round or oval protruding from the skin of the pimples. People with low immunity, trauma, immunodeficiency, and long-term use of immunosuppressive drugs are more susceptible to viral infections, leading to the onset of the disease. Viral infection is mainly through close contact, contact with contaminated objects, which may lead to infection of this disease. Once diagnosed with flat warts, it is recommended to thoroughly disinfect daily necessities and also give symptomatic treatments such as antiviral and immune regulation under the guidance of doctors. In summary, flat warts are caused by viral infections and are somewhat contagious. If you have a sudden onset of flat pimples that are not relieved, or if the warts gradually increase in size and itching is severe, it is recommended that you consult a dermatologist in a hospital and use medication in conjunction with your doctor’s advice.